Process for the manufacture of insecticides and method of making same



Patented Jan. 26, 1932 PAE EOSGOE E. CARTER, 01 WASHINGI'OH, DIETBIGT Oi oonnm m PRQOESS FOR THE MANUFACTURE OF mSECTICIDES AND METHOD OF KAKING SAEE Ho Drawing.

Application filed November 15, 1929., Serial No. contra I (GBAKTED Tm 110T 0F mil H 3, 1383-, AS AHEBDED 30, 1928; B70 0. G. 757') This application is made under the act of Marchi-l, 1883, amended April 30, 1928, and the invention herein described may be manufactored and used by or for the Government for governmental purposes without payment heated and the resultant gel is filtered, washed and dried by any suitable means.

As pointed out in other patent applications of mine, the double fluorides or the alkali metals are useful insecticidal materials and can be formed from water soluble salts of aluminum by treatment with alkali metal molecular proportions. There is also available com1 iercially some water insoluble compounds of aluminum as the oxide AhO 'or the hydrate, etc. Therefore I propose as a s new and useful-invention the process of;treat-' ing an insoluble compound of aluminum with al acid in the proper molecular. proportions and heating the reaction mixture wherein is preci itated the insoluble double fluoride'of the a all metal with aluminum. As an illustration this equation is given:

ration is given: One hundred and fifty grams of aluminum oxide, A1 0,, was mixed 1n six droxide, KOH, and to this mixture was added stirrmg. Considerable heat was generated by the chemical reactions taking place and enough heat wasadded externally to bring which temperature it was maintained for compounds and fluorine acids in the proper' ali metal compounds and hydrofluoric or its aqueous solution wherein is tated the water insoluble double fluoride, drythe gel and comminuting.

-2. The. process of making preparations containing water-m'soluble dou- The following example of an actual prepa- 735 g. of hydrofluoric acid, HF, 48%, with" the reacting mixture to the boiling point at 20-30 minutes. The reactions take place with the liberation of heat and additional heating was not necessary to complete them, but was desirableto speed them up and cause a more intimate mixture of the reactants. The double fluoride of potassium and aluminum, K hlil}, being insoluble, was precipitated in a gelatinous form, filtered, washed several times with water, dried and powdered by grinding.

lib

m A small quantity of water is necessary in excess of that formed in the reaction for con- I venience of manipulation. It does not mas tcrially change the reaction when any two are mixed separately and the third added or when all three are mixed simultaneously. Probably the most convenient however is to mix the A1 0 with the KGB in a small .7

amount of water and then add aqueous hydrofluoric acid. Gaseous .HF would give the same reaction. Considerable heat is generated by these reactions, causing them to proceed rapidly.- Other insoluble aluminum compounds. as ARCH) etc. ma be used and other alkaline hydroxides, oxi es, peroxides, carbonates, etc. may be substituted.

I claim:

-1. The process of making insecticidal preparations containing 1e fluorides of the alkali metals with alumimun "which comprises treating a water insoluble compound of with alkali metal compoundsfin suspension in the presence of water and gaseous hydrofluoricacid,

precipile fluorides of the alkali metals with aluminum which com rises treat a waterinthe geland comminutin' f r RQSG E-H. CARTER.

'cidal' water insoluble don soluble compoun of aluminum with the 'hy-" liters of water with 495: g. of hydroxide. ofany alkali metal and hydrofluoric 

